package com.lym.reggie.filter;

import com.alibaba.fastjson.JSON;
import com.lym.reggie.common.BaseContext;
import com.lym.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

/**
 * 检查用户是否已经完成登录
 * filterName过滤器名字
 * urlPatterns拦截的请求，这里是拦截所有的请求
 */
@WebFilter(filterName = "loginCheckFilter",urlPatterns = "/*")
@Slf4j
public class LoginCheckFilter implements Filter{
    //路径匹配器，支持通配符
    public static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        // 0 对请求和响应进行强转,我们需要的是带http的
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;

        //1、获取本次请求的URI
        String requestURI = request.getRequestURI();// /backend/index.html

        log.info("拦截到请求：{}",requestURI);

        // 定义不需要处理的请求路径  登录、登出、页面（只拦截除登录登出外的 Controller的请求）(静态页面我们不需要拦截,因为此时的静态页面是没有数据的)
        String[] urls = new String[]{
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**",
                "/user/sendMsg",
                "/user/login"
        };


        //2、判断本次请求是否需要处理
        boolean check = check(urls, requestURI);

        //2.1 如果不需要处理，则直接放行
        if(check){
            log.info("本次请求{}不需要处理",requestURI);
            filterChain.doFilter(request,response);
            return;
        }


        //3. 放行已登录的
        //3.1、判断后台系统员工用户的登录状态，如果已登录，则直接放行
        if(request.getSession().getAttribute("employee") != null){
            log.info("用户已登录，用户id为：{}",request.getSession().getAttribute("employee"));

            /*//线程id
            long threadId = Thread.currentThread().getId();
            log.info("LoginFilter  :ThreadLocal获得的id:{}",threadId);*/
            // 1）用户ID存储到ThreadLocal。为后面在MyMetaObjecthandler中，统一为公共字段赋值
            Long id = (Long) request.getSession().getAttribute("employee");
            BaseContext.setCurrentId(id);

            // 2）放行
            filterChain.doFilter(request,response);
            return;
        }
        //3.2、判断移动端用户的登录状态，如果已登录，则直接放行 存到Session中
        if(request.getSession().getAttribute("user") != null){
            log.info("用户已登录，用户id为：{}",request.getSession().getAttribute("user"));

            // 1）用户ID存储到ThreadLocal。为后面在MyMetaObjecthandler中，统一为公共字段赋值
            Long userId = (Long) request.getSession().getAttribute("user");
            BaseContext.setCurrentId(userId);

            // 2）放行
            filterChain.doFilter(request,response);
            return;
        }




        log.info("用户未登录");
        //4、如果未登录则返回未登录结果，通过输出流方式向客户端页面响应数据
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
        return;

    }

    /**
     * 路径匹配，检查本次请求是否需要放行
     * @param urls
     * @param requestURI
     * @return
     */
    public boolean check(String[] urls,String requestURI){
        for (String url : urls) {
            //把浏览器发过来的请求和我们定义的不拦截的url做比较，匹配则放行
            boolean match = PATH_MATCHER.match(url, requestURI);
            if(match){
                return true;
            }
        }
        return false;
    }
}
